Breakdown curves of CH2(+), CH3(+), and CH4(+) molecules - II. Application to chemical reactions and astrophysical implications

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Volume 640 (August 2020)

A&A, 640 (2020) A115

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Table 5

Branching ratios for charge exchange reactions between CH_y and He⁺.

Reaction	Model (± error)	KIDA15	δIP/δE
CH₂ + He⁺ →			14.29
C⁺ + H₂	0.00 (0.01)	0.5	10.19
CH⁺ + H	0.00 (0.01)	0.5	9.79
CH + H⁺	0.02 (0.02)	0	6.74
C⁺+ H + H	0.20 (0.04)	0	6.81
C + H + H⁺	0.78 (0.07)	0	3.16

CH₃ + He⁺ →			14.85
CH + H	0.29 (0.05)	0.5	9.68
CH⁺ + H₂	0.00 (0.01)	0.5	9.58
CH₂ + H⁺	0.05 (0.02)	0	6.38
CH + H	0.01(0.01)	0	4.77
C⁺ + H + H₂	0.06(0.02)	0	5.59
CH⁺ + H + H	0.37(0.06)	0	5.19
C + H⁺ + H₂	0.06(0.02)	0	3.13
CH + H + H⁺	0.14(0.04)	0	2.13
C + H + H	0.01(0.01)	0	1.39
C⁺ + H + H + H	0.01(0.01)	0	1.20

CH₄ + He⁺ →			11.75
CH + H	0.00 (0.01)	0.05	10.22
CH + H₂	0.00 (0.01)	0.54	9.44
CH₃ + H⁺	0.02 (0.02)	0.27	6.37
C⁺ + H₂ + H₂	0.01 (0.01)	0	5.35
CH + H + H	0.44 (0.10)	0	5.06
CH⁺ + H₂ + H	0.16 (0.04)	0.14	4.95
CH₂ + H	0.01 (0.02)	0	4.37
CH + H₂ + H⁺	0.07 (0.02)	0	1.89
CH₂ + H + H⁺	0.22 (0.03)	0	1.75
CH⁺ + H + H + H	0.04 (0.03)	0	0.59
C⁺ + H₂ + H + H	0.03 (0.03)	0	0.15

Notes. In the last column, the difference between the ionization potentials of the two reactants is given in bold together with exothermicity δE for the different outgoing channels.

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